01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt until well blended.
03 - In a separate bowl, whisk eggs, oil, yogurt or sour cream, lemon zest, lemon juice, and vanilla until smooth and combined.
04 - Pour wet ingredients into dry ingredients. Gently fold together until just moistened; do not overmix.
05 - Toss raspberries with 1 tablespoon flour to coat, then gently fold into batter until evenly distributed.
06 - Divide batter evenly among prepared muffin cups, filling each about three-quarters full.
07 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
08 - Let muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.